Alarm-signal.



77717221170:- Jmvew Patented Ian. l5, I90l. J J RUSS ALARM SIGNAL.(Application filed Mar. 26, 19'00.

(No Model.)

JAMES J. ROSS, OF DETROIT, MICHIGAN, ASSIGNOR TO THE THREE RIVERSRAILWAY SUPPLY COMPANY, OF THREE RIVERS, MICHIGAN.

ALARM-SIGNAL.

SPECIFICATION formingpart of Letters Patent No. 666,067, dated January15, 1901.

Application filed March 26,1900. Serial No. 10,174. (No model.)

To ail whom it may concern" (shown in full lines, Fig.2) and includesthe Be it known that I, JAMES J. ROSS, a citizen battery D,circuit-closing relay E, and the of the United States, residing atDetroit, in normally open breaks S and S.

the county of Wayne and State of Michigan, I" designates an auxiliarycircuit which inhave invented certain new and useful Imcludes betweenthe pointsaandbthebranches 55 provements in Alarm-Signals, of which theH and I, before described in connection with following is aspecification, reference being the alarm-circuit,the battery andrelayE,just had therein to the accompanying drawings. referred to, andthe normally open break T.

The invention relates to certain improve- The several circuits and theirarrangement IO ments upon the electric signal apparatus having been thusdescribed, the operation of 60 shown and described in Letters Patent No.the mechanism is as follows: Upon the en- 522,431, which issued to meJuly 3, 1894; and trance of a train in the block A the trackit consistsin the novel arrangement of the battery B therefor is short-circuited,the circuits, whereby but one battery and a less track-relay C out out,and its armature pernumber of contact-points are required to promittedto drop, thereby closing the nor- 65 d nce the desired results. mallyopen breaks J and S. The break K be- In the drawings, Figure 1 is adiagrammatic ing normally closed, the short-circuiting of View showingthe general arrangement of the the track-battery B establishes thealarmcircuits and the electrical appliances, the circuit through itsbranch H, as plainlyindi- 2o alarm -circuit and its two branches beingcated in Fig. 1, and the bell is caused to ring. 70 shown in full andbroken lines, respectively. Upon the entrance of the train into theblock A Fig. 2 is a diagrammatic view of the main from the block A thetrack-battery Bis shortcircnit, and Figs. 3 and 4. are similar views ofcircuited and the track-relay C out out. The the auxiliary circuit.armature of said latter relay drops and closes In the drawings thusbriefly referred to the the normally open breaks S and M. The 75reference-letters A A designate two trackbreak S having been closed uponthe shortsections upon opposite sides of a crossing, circuiting of thebattery B, the closing of the which are properly insulated in the usualbreak S establishes the main circuit through manner. the relay E and thetwo normally open breaks B Bare the track-batteries for the blocks S andS, as plainly indicated in the full lines, 80 described, and C O are thetrack-relays, pro- Fig. 2. Upon the passage of the train onvided,respectively, with armatures O and O tirely out of the block A into theblock A the D represents the single battery common to relay 0 is againenergized by its track-batall the circuits. tery, the breaksJ and Sopened, and the aux- E is the locking-relay, and F represents the iliarycircuit P is established through its 8 5 alarm-bell, which is located atthe crossing. branch I, as indicated by the full lines in a The letter Gdesignates the alarm-circuit, Fig. 4. This latter circuit is maintainedunwhich includes the battery D, alarm-bell F, til the train passesentirely out of the block of any ordinary type, a normally-closed breakA, when the relay E is deenergized, the break K, controlled by a switchin the form of an K closed, the track-relay O energized by its 90armature Lof the circuit-closing relay E, and battery, and the breaks Sand M opened. two branches H and I between the points a, The parts ofthe mechanism are thus restored and b. The branch H (shown in fulllines, a to their initial position in readiness to signal Fig. 1)includes a normally open break J, conthe next train.

trolled by the armature of the track-relay C. It will be obvious fromthe description of 5 The branch I (illustrated in dotted lines in themechanism that if a train should enter the same figure) includes thebreak M, northe insulated track-sections by way of the mally open, whichis controlled by the armablock A the operation just described would tureof the relay C. be practically repeated, with the exception The letter Prepresents the main circuit that the auxiliary circuit would be estab-I00 lished through the branch H, as indicated in by the track-relays,and an auxiliary circuit Fig. 3, and the alarm-circuit through thebranch I.

What I claim as my invention is- In an electric signal forrailway-crossings,

the combination of an alarm-circuit having including the circuit-closingrelay, a normally open break controlled by said latter relay, and havingtwo branches each including a normally open break controlled by one ofthe track-relays.

In testimony whereof I affix my signature in presence of two witnesses.

- JAMES J. ROSS. Witnesses:

L. J. WHITTEMORE,

H. 0. SMITH.

